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The research refers to the numerical study of cavitation phenomena when liquid-gas flow was passing through the venturi nozzle. The dynamics of the cavitating bubbles are modeled by the use of the mass and momentum phases equations, which are coupled with the Rayleigh-Plesset equation of the N bubbles dynamics. However, assuming that the same initial conditions of all bubbles are identical and that all bubbles are equi-distant from each other simplifies the governing equations. The effects of the bubble population size and the upstream void fraction on flow parameters are investigated. The numerical resolution of the previous equations set (ODE) let us found that the characteristics of the flow change dramatically with upstream void fraction. Also, obtained numerical result shown that, as the number of bubbles is increased, the natural frequency and the damping of the bubbles decrease. Beside, the distance between bubbles decrease leads to increase of the damping and the natural frequency.
